On Sep 11, 2015, at 12:00 PM, qemu-discuss-requ...@nongnu.org wrote: > On 10/09/2015 8:58 AM, Maximilian H. wrote: >> Hello, >> >> I was looking into what parts would need change to save and restore the >> nvram content for the qemu-system-sparc vm between boots. >> >> I see the code in hw/timer/m48t59.c that implements the nvram. >> >> So some questions arise, and before I spend too much time poking around >> the still unknown code, I'd thought I ask first. >> >> 1. Command line processing starts in vl.c in the main fct there ? Can I >> add a command line argument there, say "-sparcnvram" ? >> >> 2. In hw/timer/m48t59.c has no functionality that I see from having a >> look at it (not in depth) to save or restore the nvram's contents for >> sparc. Is there a general facility that qemu has that provides such a >> functionality - i.e. is there a general qemu save and restore framework ? >> >> 3. Is there an example somebody could point me to that implements >> something similar ? Imitation is the sincerest of flattery .... >> >> 4. All the alarm and watchdog functionality that the m48t08 provides, is >> that used on sparc too ? >> >> 5. Besides what is in >> http://wiki.qemu.org/Documentation/GettingStartedDevelopers, is there >> some qemu coding documentation to make it faster for somebody unfamilar >> with qemu's code like me to be able to implement something ? I'd like to >> spend a few evenings on this, produce a patch and move on. >> >> Thanks >> BR >> Max. >
This sounds like a good idea. Having OpenBIOS settings actually be saved between boots would make things more real. Mark, do you think it is possible for a QEMU command line option to actually load the saved OpenBIOS settings from a file and restore them into memory? I'm thinking something along the lines of -prom-memory <file name>. Max, there is a project that you should probably look at called OpenBIOS. It implements an implementation of Open Firmware. Here is where more info can be found: http://www.openfirmware.info/Welcome_to_OpenBIOS. If you do want to implement this feature, it would help to know how the BIOS is implemented.